ya i do undersand that, well like i said it probably going to be a mix for one reason or another.

Well i wasn't thinking about focusing on a specific mythology, one reason is because not all demi-gods would follow under a mythology. so it would be more of a merge of mythologies along with some unexplained things, one reason is because i don't want to leave something's out because i choose one mythology over another. When the world ended, at the event itself (which i hadn't really decided it or the time line yet) specific people across the world would of been affected by the event, which caused their bodies to develop and change, Their powers, and everything would of been developed from their personalities at that time, their thoughts and everything. Basically everything that made them unique would influence their Demi-God Abilities.

That also includes their interests, like if they was more interested in a certain mythology it could affect their 'true form' which is created when they become a Demi-god, which not all Demi-Gods need to be originally humans.

All demi-gods will have some specific abilities that are the same. They can't Age anymore, They regenerate easier than normal people so if they lose an arm it can regrow back after so long (Not Instantly unless that is part of their specialty), breathing isn't a requirement but a comfort. and some similar things like these.